Question

Two point charges are fixed on the y-axis: a negative point
charge q1=-22μC at y1=+0.24m and a positive point charge q2 at
y2=+0.38m. A third point charge q=+8.5μC is fixed at the origin.
The net electrostatic force exerted on the charge q by the other
two charges has a magnitude of 25 N and points in the +y direction.
Determine the magnitude of q2